Patatje Oorlog from any “snackbar”.

In The Netherlands the “snackbar” is where you go to get your chips, and contrary to popular belief, Dutchies aren't just about the mayonnaise. The best sauce comes with “patatje oorlog”, a mix of mayo, sate sauce and onions and it translates to war chips. Manneken Pis is known to be one of the best places to get your fix.